With stars like Steve Buscemi and Sarah Silverman and big-fish producers such as Spike Lee and Stanley Tucci on board, you’d think this indie would offer some glimmer of wit or originality. Think again. Saint John of Las Vegas, writer-?director Hue Rhodes’ excruciatingly awful feature debut, is a shaggy road movie to nowhere. An uncharacteristically bland Buscemi plays a gambling addict/insurance-fraud investigator who stumbles across a series of ”quirky” characters (a stripper in a wheelchair, a gun-crazy nudist, and a human-fireball carny) while trying to debunk a claim. Sound painful? You didn’t have to sit through it, pal. D-